We use sales kits alot and like them. We do not allow component update on the order.. seems risky and we have must ship complete checked on them (part master) and print components.
One thing I would consider doing at initiation of use is to associate the kits with the parts they are sold to go with - complementary parts. Then sales personnel entering orders would know what goes with what and could upsell if desired. Tim S posted about the complementary parts here: Create multiple line items that are similar parts - #26 by timshuwy
Nancy